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OES-Idlmdd Market August 16,1995 Page-3- • and field screening. The bottom-most tube was immediately sealed with Teflon tape, capped, wrapped with duct tape, labeled, and stored in a cooler chilled with Blue Ice to await shipment to the laboratory. Geologic logs were prepared by a Condor geologist trained and experienced in the use of the Unified Soil Classification System under the supervision of a registered engineer. Soil I samples were screened in the field using a portable OVA. Drill cuttings and soil samples indicated the soil from the ground surface to approximately six feet bgs was medium- to dark brown, silty sand Gray brown, indurated silt was present from 6 feet to approximately 11 feet bgs Medium brown silty sand to sand was present from 11 feet to 15 feet bgs. The soil samples were generally moist and field screening measurements indicate no evidence of ' hydrocarbon contamination The approximate location of the soil samples collected from SB1 through SB5 are shown on Figure 3 and Figure 4, Appendix A- The geologic logs are in Appendix B. I Soil excavated during the UST removal and over-excavation have been aerated on site ' since in August, 1994. Approximately 75 cubic yards of gasoline contaminated soil were aerated under permit issued by the San Joaquin Valley Unified Air Pollution Control District. At the ' direction of the SJCPHS,EHD representative on site during drilling, Condor collected two soil samples from the stockpiled soil. The soil samples collected from the borings and the stockpile were hand delivered within 12-hours of collection following chain-of-custody procedures to ' GeoAnalytical Laboratories in Modesto, California, for analyses ' The soil cuttings from each boring were added to the existing stockpile on site. The borings were tremie-grouted with a cement slurry containing 4 percent by weight bentonite. ' After the grout settled, the top 1 to 2 feet of each boring was backfilled with soil from the existing stockpile ' 5.0 LABORATORY ANALYSES The soil sample collected from SBI at 10 and 13 feet and from SB2 through SB4 at 10 ' and 15 feet were retained for laboratory analyses. The remaining soil samples were placed on hold at the laboratory pending results of analyses. The samples collected from the borings and ' stockpile were analyzed for benzene, toluene, ethel benzene and total xylene (BTEX) by EPA Method 8020 and for total extractable petroleum hydrocarbons quantified as gasoline (TPH-G) ' by Method 5030/LUFT The soil samples collected from SB1 and SB2 at 10 feet bgs were also analyzed for Ethylene Dibromide (EDB) by method LUFT Laboratory report sheets mdicating . analytical methods used, detection limits, and results of analyses are presented in Appendix C. A�P�P_ ' �� CONDOR